Keyboard for Ai vs Sigmakey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Keyboard for Ai
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Type real math symbols into any AI chat app, note, message, or document — without fighting the iOS keyboard. The standard keyboard has no √, ∫, π, or Greek letters, so typing math on mobile is slow and clumsy. Keyboard for AI gives you a clean, categorized math symbol keyboard, so every symbol is one tap away. 7 SYMBOL PAGES • Basic — numbers, + − × ÷, ( ) [ ] { }, ≤ ≥ ≠ ≈, √ ² ³ π • Algebra — roots, superscripts & subscripts, ± · ⊕ ⊗, variable letters • Calculus — ∫ ∮ ∬, ∂ ∇ Δ, ∑ ∏, lim, log, ln, → ⇒ ∞ • Trigonometry — sin cos tan, sinh, arcsin, π τ °, e i • Logic & sets — ∈ ∉ ⊂ ∪ ∩ ∅, ∀ ∃ ¬ ∧ ∨, ℕ ℤ ℚ ℝ ℂ • Greek — full lower and upper case: α β γ … ω, Α Β Γ … Ω • Stats — μ σ Σ, ⌊ ⌋ ⌈ ⌉, gcd lcm mod CLEAN UNICODE OUTPUT Everything types as standard Unicode (x², √, ∫, π, ≤, α), so it pastes perfectly into AI chat apps, Notes, WhatsApp, and email — no broken LaTeX, no rendering glitches. WORKS EVERYWHERE Use it in any app with a text field, on iPhone and iPad. From high school through university — algebra, calculus, linear algebra, statistics, logic, and Greek. FREE & PRO The Basic page is free forever. Keyboard for AI Pro unlocks the advanced pages — Algebra, Calculus, Trigonometry, Logic, Greek, and Stats — with a 7-day free trial, then $1.99/month, cancel anytime. PRIVATE BY DESIGN What you type is never stored or sent to us. Keyboard for AI Pro is an auto-renewing subscription: $1.99/month after a 7-day free trial. Payment is charged to your Apple Account; it renews automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in your Account settings. Privacy Policy: https://aikeyboard-legal.keremarslan.workers.dev/privacy.html Terms of Use: https://aikeyboard-legal.keremarslan.workers.dev/terms.html
Sigmakey
This utility provides a specialized keyboard for typing mathematical expressions, including fractions, roots, and Greek letters, directly within any app. It supports LaTeX, Unicode, and image output, with on-device processing for privacy and speed.
- Full math keyboard layout
- Two-dimensional cursor for exponents/numerators
- Type LaTeX, Unicode, or rendered image
- On-device typesetting, no network required
- Symbol search, recent, and favorite symbols
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Sigmakey is a math keyboard for people who need to type actual math, anywhere you can type at all. Fractions, exponents, roots, Greek letters, and matrices sit one tap away, and the cursor moves right into a numerator or an exponent, so scientific notation looks the way it should. - A full math keyboard layout that works in any app with a text field - A two-dimensional field with a cursor that steps into fractions and powers - Type LaTeX, plain Unicode, or a rendered image, whichever the app expects - Everything typeset on device, with no network - Search for a symbol, or grab a recent or a favorite Drop an equation into a note, a message, or a homework app without hunting through menus. Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vTDX9pxPOlUJl_skVUHPi99mAw0y2B2BYd_v1mJkoF3xW3rlOcW5KlYd4t93MMbbGhctSTnBTy7d_l6/pub Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is iOS requirement: Keyboard for Ai at 16.0 against Sigmakey's 26.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Keyboard for Ai sells 1 in-app purchase, starting at $1.99 per month and Sigmakey sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | Keyboard for Ai | Sigmakey |
|---|---|---|
| Price | Free | Free |
| Rating | — | 2.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 10 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Kerem ARSLAN | Andrii Bashta |
In-app purchases
Keyboard for Ai
- Keyboard for AI Pro7 Days trial$1.991 Month
Sigmakey
- Sigmakey Pro$9.99
Questions
Is Keyboard for Ai free?
Is Sigmakey free?
Do Keyboard for Ai or Sigmakey have ads?
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